Removable contact tip



mec, 23, 1924.

RJ SWARTZ REMOVABLE CONTACT TIP Filed July 13, 1922 Syvum/Lion:

zo ing means Der; 23, 1824,

STS

ATENT REMOVAB'LE CONTACT TIF.

Application filed July 13,

To all 'whom 'it may concer/n:

Be it known that l, RAYMOND Swnn'rz, a citizen of the United States, residing at Harrisburg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Removable Contact Tips, of which the following is a specification.

My invention relates to contact fingers for controllers or switching devices and more particularly to such fingers as are adapted to engage the contact ring segments of drum type controllers.

Contact fingers of the drum type of controllers are provided upon their free ends with contact or burner tips which are usually screwed or riveted to the finger. `When the burner tip has become worn and is to be replaced considerable diiiiculty is experienced in removing the same when it is riveted to the finger since it is necessary that the contact finger be removed from the controller in order that the rivets may be driven out and a new tip riveted on. lWhere the burner tip is screwed upon the contact finger while the removal thereof is comparatively simple, yet the objection to this expedient is that after the tip has been upon the finger some time the screws work loose and the result is a poor contact between the burner tip and the contact finger. It is therefore the primary object of my invention to provide a novel and improved means whereby a contact tip may be removably secured to a contact nger for ready replacement when worn and which will maintain a good contact with the contact finger at all times.

A further object of the invention is the provision of a very simple contact tip securwhich is readily applicable to standardY contact tips and fingers with but slight modification thereof, and which will elfectually hold the Contact tip in place upon the finger.

l/Vith the above and other objects in view as will become more apparent as the description proceeds, the invention comprises a novel combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing, forming a part of this specification.

In the drawing, Figure 1 is a plan view of a portion of a Contact finger, the Contact tip of which is secured in accordance with my invention;

1922. Serial No. 574,813.

Fig 2 is a rear elevation thereof;

F ig. 3 is a central longitudinal sectional view on the line 8 3 of Fig. 2;

Fig. L1 is a detail in plan of the inner face of the contact tip and,

F ig. 5 is a detail of the contact finger with the contact tip removed.

Referring` specifically to the drawing, wherein like reference numerals designate like parts throughout the several views, numeral 10 denotes a contact finger of the conventional type comprising the usual spring metal strips 11 with a plurality of relatively thin copper' strips 12 therebetween. Since the contact finger, per se, forms no part of the present invention a further description thereof is unnecessary.

Coming now to the subject matter of my invention, a transverse hole is drilled in the free end of the contact finger 10 through which the threaded end of a bolt 13 freely..y passes carrying upon its inner or headed end a wedge-shaped member 14 upon which the burner tip 15 is supported.v The side edges of the wedged shaped member 1a are inwardly beveled as shown at 16 and the burner tip 15 is provided with a vertical wedge-shaped'groove 18, for the recept-ion of the member 14E, the walls of said groove being outwardly beveled as shown at 19 to conform to the inward bevel of the edges of the wedge-shaped member 14. It will thus be seen that when the reduced end of the wedged-shaped member is inserted in the widened end of the groove 18 and driven upwardly that the contact tip 15 will be effectually held thereon with the widened end of the wedge-shaped member 14 serving as a support for the burner tip 15. The member la may be soldered, riveted or secured upon the end of the bolt 18 in any other preferred manner. A spring washer and nut, 20 and 21 respectively, upon the free end of the bolt 13 rigidly hold the wedge-shaped member to the contact finger. A portion of the contact drum of the controller is shown at 22 bearing the ring seg ment 23 against which the burner tips strike when the drum is rotated.

t will be noted that the thickness of the wedge-shaped member 111 is considerably less than the depth Of the groove 18 of the burner tip 16 and that the width of said wedge-shaped member is approximately equal to the back of said groove 18, the ob ject of this construction being to draw the .taot therewith.

From .the foregoing. descriptionreadvzin connection with the accompanying drawing, the novel features of my invention: willf be clear to those skilled in the art and the advantages thereof readily appreciaterhWhen the burner tip 15 has become worn and a new one is'r-equired, it is=only necessary. that it be; given a few'taps uponritss-b'ottom? edge with a hammer to loos-enit.from"the"1nem ber 14^whereuponi it may beliftedfoff-and a new tip slipped thereonx Both.operations may'be:accomplishedin a few seconds.l without the necessity of removal of the contact finger' 10 from its position; v Anotherrinode ofiremoving the burnery tip: is to: loose-n' the' nut Q12 whereupon itimay beislip'ped off' and another putin itlsPplace after.' which theV nut 21g-'willbe;4 tightenedf todraw" thei` wedge.- shaped 'member' 141 with .the burnertip`w15 tightly against the' contact finger '10.'

While'l ha-veillu'strated thewedgeshaped member- 1'4 as'lbeing. bolted; Eto thercontact finger 10, it will be understoodl that vit may be rivetedmr otherwisesecured' thereto.

Inf accordance' withl .thepate'nt statutesV I have" describedl and illustrated the preferred embodiment'fiof: my invention'lnlt-#I' dornot propose to limit myself strictly.there'togsince various modifications ther-eet will"` readily suggest' themselves to those skilled-tin the art without' departing from' the spirit of my inventionrthelscope=of which is set forth in theappended claims Having thusfd'escribeduny inventionfwhat I claim is newand desire' to secure-'by' Letters Patent ist `1".f-'Ihe combination witha contact finger of a wedgeesh'afped member secured' thereto; the side edgesl ofsaidz wedgeishaped meinber heinginwar'dly beveledf tothe-inner face thereof, anda burneri tip' carried@ said wedge-shapedi member and yhaving awedgeshaped slot upon its inner face, y-thes'i'deE walls of' which' are outwardly" beveledt'o'f thel bottom thereof; -for thel reception of said@ wedgeshaped member, the' thi'clrness'of'- said wedgeL shaped member being less than the depth of said slot, and the' widthl of saidkj wedge s'haped-memberapproximating the width-of said groove' at' thebac'kthereof.' A

"2. The' combination with a' contact'fing'er of u a `supportsecured" thereto, the side walls of saidsuppor't kconverging in' the direction of `its length, aburne'rdtip carried by said support,rsaidfburner tip having al groove in one face thereoffor the reception :of said support, and the walls of said groove converging'.v inthe direction` of, its length.

3.The combination with a contact finger; of a-burner tip having a substantially closed transverse recess accessible from one edge-.thereofy and al support carried by said ing` ar. groove lin its-'inner fface, l the' sidewalls Y of saidA groove being'` outwardly beveled. to' wardthebaclz thereof lto rece-ire*said` support7 the thickness of said member: being-,less than: thetdepthl ofy saidagroovegandvthe Width ofsaid' support approximating, thewidthf-of saidrgroove' at the-fbaclri thereof;

5.' The combinationlf wit-h:v a Contact fin'- ger; of a wedge-shaped member-1Y secured thereto, theJ side edgeso'f said. wedgesshaped member being; @inwardly zbeveled'` yto the' `inner face thereof, and a' burner tipfarried by said Wedgeshapedmmember and. having ar wedge-shaped slot -upon'its` inner face thesideA walls of Whiehaareoutwardly beve eled to the bot-tom.' thereoffor, the f recept-ion of said' wedge-shapedtmembeg the.thickness of said wedge-shapedlmemberbeing less-than the depth-I of* said slot,` thewidth of4 said wedge-shapedI member approximating the width? of saidggroovefat theeback thereof,

and means including ai spring? washer for clamping-gsaidwedge-shapedmember vto said finger i y 62 rlhecombinationV with a" contact nger ,i -ofL af `support secured thereto,E said support having inwardly beveledf-side?edges` a burner ti-pfA carried -by said support andhaving a groovel in1 its innern face, the side,v walls ofsaid` groove' beingfoutwardly .beveled toward the haelt thereof to receive saidv sup port, the thickness of saidmember being less V than the depth of said;` groove, the. width of said support approximating? the vmidfthy of said groove at. the 'back` thereof,f. and means including a spring washerfor lclamping said support toV saidifingser.- Y

In testimony wher-eofIiairiX- my signature iny the presence cfa two witnesses.I

" Witnesses v GLOTZMAN, W. Bf. Damn 

